问题
选择题
--- Hello! Is Mr. John in the office?
--- Yes. But I’m sorry. He is busy _________ and can’t speak to you.
A．at once
B．at present
C．at the end
D．at first
答案
答案：B
词义辨析。A立刻，马上；B现在；C最后；D起初。句意：—你好，Mr John在办公室吗？—是的。但是对不起。他现在很忙，没有时间和你说话。故B正确。